From: Emmanuele Bassi <ebassi@gnome.org>

See also: https://gitlab.gnome.org/GNOME/gnome-todo/commit/6cdabc4dd0c6c804a093b94c269461ce376fed4f
--- gnome-todo-3.28.1/plugins/eds/gtd-eds-autoptr.h.orig	2020-05-06 14:20:49.589902539 +0200
+++ gnome-todo-3.28.1/plugins/eds/gtd-eds-autoptr.h	2020-05-06 14:20:54.593919721 +0200
@@ -25,4 +25,3 @@
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (ECalComponent, g_object_unref);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (ECalComponentId, e_cal_component_free_id);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (ECalClient, g_object_unref);
-G_DEFINE_AUTOPTR_CLEANUP_FUNC (ESource, g_object_unref);
